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美国标准
美制
锥
形
管螺纹
gen.
national taper pipe thread
mech.eng.
national
standard
pipe taper thread
美国标准锥管螺纹
auto.
National pipe thread/American Standard Taper Pipe Thread
dril.
American standard taper pipe thread
美 国 标准 锥 管螺纹
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